Banca de DEFESA: ALINE APARECIDA SILVA PEREIRA

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
DISCENTE: ALINE APARECIDA SILVA PEREIRA
DATA: 25/04/2022
HORA: 08:00
LOCAL: Videoconferência
TÍTULO:

From soil to seeds: unveiling how cadmium and manganese interact spatio-temporally during the lifecycle of sunflower plants

PALAVRAS-CHAVES:

Helianthus annuus L.;Trace elements; phytoremediation; stress condition; metabolism response

PÁGINAS: 95
GRANDE ÁREA: Ciências Agrárias
ÁREA: Agronomia
RESUMO:

Revegetation and remediation of areas contaminated by potentially toxic elements and high concentrations of essential elements are a current challenge, especially with regard to the interaction and factors that affect the bioavailability of these ions. Helianthus annuus L. is considered a phytoremediator, being tolerant to high concentrations of non-essential elements. Thus, this work aimed to evaluate how the synergistic disposition of Cd and Mn in the soil can interfere in the phytoremediation potential, in the photosynthetic metabolism and in the productivity of sunflower plants. For this, the plants were cultivated during the entire biocycle under six conditions: control (T1); 1.3 mg. Kg-1 of Cd (T2); 5 mg. Kg-1 of Cd (T3); 400 mg.Kg-1 of Mn (T4); 1.3 mg.Kg-1 of Cd and 400 mg.Kg-1 of Mn (T5); 5 mg.Kg-1 of Cd and 400 mg.Kg-1 of Mn (T6). The incident and absorbed irradiance data were evaluated throughout the experiment using a pyranometer. The photosynthetic parameters were evaluated in two moments of the vegetative and reproductive phases and, at the end of the experiment, the biomass, the oil content in the achenes, the productivity and the concentrations of Cd, Mn and P in the soil, root, leaf and achenes were quantified. These data were used to calculate the bioaccumulation potential, translocation rate and element tolerance. In the end, it was concluded that the concentration of 400 Mn did not interfere in the phytoremediation potential of sunflower for Cd, and the bioaccumulation of this element was increased.
However, Cd reduces Mn uptake and does not interfere with P uptake. Plants showed greater tolerance to Cd and to Cd and Mn together at both concentrations than at 400 mg Mn. Regarding photosynthetic metabolism, plants grown at 400mg Mn showed the lowest rates of A, Ci/Ca and gs, the other treatments showed adjustments in these parameters. For total dry matter, root/shoot ratio and productivity, the treatment containing 400 mg Mn also presented the lowest values, followed by treatments containing Cd and Mn at both concentrations. The plants showed delay in plant development when grown in soil containing 400 mg of Mn and in the condition where there was synergistic availability of Mn and Cd at
both concentrations, mainly in the reproductive period, but all plants completed the biocycle.

MEMBROS DA BANCA:
Interno - VITOR DE LAIA NASCIMENTO (Membro)
Externo à Instituição - THIAGO CORRÊA DE SOUZA - UNIFAL (Membro)
Interno - PAULO EDUARDO RIBEIRO MARCHIORI (Membro)
Externo à Instituição - MARCELA CARLOTA NERY - UFVJM (Suplente)
Externo à Instituição - Kacilda Naomi Kuki - UFV (Membro)
Externo ao Programa - HELOISA OLIVEIRA DOS SANTOS - DAG/ESAL (Suplente)
Presidente - FERNANDA CARLOTA NERY - UFSJ (Membro)